AdditionalProperties ignored for Typescript definition generation

[fredericbarthelet]

Thanks for the amazing work done in this library !
I'm struggling a bit with additionalProperties JSON-schema property.
As stated from the documentation:

The additionalProperties keyword is used to control the handling of extra stuff, that is, properties whose names are not listed in the properties keyword. By default any additional properties are allowed.

So, not defining additionalProperties is equivalent to "additionalProperties": true

However, given the following JSON-schema

{
    "type": "object",
    "properties": {
        "a": { "type": "string" }
    },
    "required": ["a"]
}

the generated Typescript definition is

export interface MyObject {
    a: string;
}

while I was expecting

export interface MyObject {
    a: string;
    [key: string]: unknown;
}

I tried setting "additionalProperties": true and even "additionalProperties": { type: "string" }, without any success. It looks like additionalProperties does not have any impact on generated Typescript definition.
You can access my latest test at https://app.quicktype.io?share=Y4Y07xZGS9zncuWpEtSt

Any advice on how to proceed with this issue ? Happy to help with a PR if pointed in the right direction :)

[nickfryar]

Any update on this? I'm having the same issue 10 months later. Also glad to help with a PR!